The effect of substituents and molecular aggregation on the room temperature phosphorescence of a twisted π-system
文献情報
Cristian A. M. Salla, Giliandro Farias, Ludmilla Sturm, Pierre Dechambenoit, Fabien Durola, Bernardo de Souza, Harald Bock, Andrew P. Monkman, Ivan H. Bechtold
Considering the relevance of room temperature phosphorescent (RTP) materials, we discuss the influence of donor and acceptor groups substituted on to a twisted three-fold symmetric hydrocarbon homotruxene, which presents a persistent RTP, even in the absence of donor or acceptor moieties, under ambient conditions as a result of the twisted π-system. Compared to a fluorine acceptor, a donor methoxy group increases the phosphorescence decay rate in solution, while in the solid-state, molecular aggregation and packing yield a very persistent phosphorescence visible by the eye. The RTP of the intrinsically apolar homotruxene is found to be modulated by polar substituents, whose main impact on the solid-state emission is due to altered packing in the crystal.
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